Can't Access my FTP from the internet

I have a Windows 2000 Server (No AD) that is set up as a FTP server running IIS. If I connect through my ftp from inside my network I am able to log in. When I log in from outside the network I get an error message.

"An error accurred opening that folder on the FTP Server. Make sure you have permission to access that folder"

I have enabled port forwarding for port 20 and 21 on my router. Did I forget a port?

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